How to change column names in shell/bash? -

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This question can be very easy for most of you, but I really do not want to do it manually. Assume that I have a file in the terminal such as: 

  [dz2t @ edison-s GWAS] $ head $ PHENO GWASID CHILDID VSTNUM GENDER GA 1001 1001 11 Woman -9 1002 1002 11 Male-9 1003 1003 11 Male-9 1004 1004 11 Male-9 1005 1005 11 Female -9 1006 1006 11-9   
 How will the names of two columns change before "GWASID" and " Children "to" FID "and" IID "  
 
 
 You can:  < Pre>  SD-A '1S / GWAISID / FID / A-A' 1S / ChildID / IID / 'Your file'   
 It says that L'1 line, alternative Jeedblyuesaidi with FID and Chaildaid with IID. If you want to overwrite this file, you will need to add the  -i  flag after the  sed  word to edit the encode.

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